Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
  • A61K31/7052—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides
  • A61K31/706—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom
  • A61K31/7064—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
  • A61P35/04—Antineoplastic agents specific for metastasis
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
  • C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
  • C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
  • C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
  • C07H19/23—Heterocyclic radicals containing two or more heterocyclic rings condensed among themselves or condensed with a common carbocyclic ring system, not provided for in groups C07H19/14 - C07H19/22

Definitions

• the invention provides a new type of compounds with anti-cancer activity and their therapeutic use.
• Pyrimidoindole ribonucleosides prepared in our group are the only known type of annulated deazapurine nucleosides, however, they displayed only minor or no cytotoxicity ⁇ formula C, ref.: Tich ⁇ , M.; Pohl, R.; Xu, H. Y.; Chen, Y.-L.; Yokokawa, F.; Shi, P.-Y.; Hocek, M. Synthesis and antiviral activity of 4,6-disubstituted pyrimido[4,5-b]indole ribonucleosides. Bioorg. Med. Chem.
• cytostatic and/or anti-tumour compounds are also disclosed in WO2018/024265 A1 , WO2018/001393 A1 and Chung F-L et al., J. Med. Chem. vol. 23(11) 1980, pp 1158-1166 .
• This invention describes new 4-substituted pyridopyrrolopyrimidine ribonucleosides possessing pyridine nitrogen in positions 5 or 7, exhibiting strong cytostatic and cytotoxic effects on cell lines preferentially of tumor origin and on broad spectrum of cancers of various histogenetic origin.
• Pyridopyrrolopyrimidine ribonucleosides represent a new and unique type of nucleosides with rigid tricyclic base, which leads to new type of interaction with biological system and therefore to different mechanism of action than all the other 7-substituted 7-deazapurine nucleosides.
• the preliminary results showed that the presence of nitrogen atom at one of the two specific ring positions is crucial for cytostatic and cytotoxic effect.
• This invention provides substituted pyridopyrrolopyrimidine ribonucleosides of general formula I : wherein,
• formula I When compounds of formula I are optically active, formula I shall be understood as including individual optical isomers and mixtures of optical isomers, including racemic mixtures.
• R is selected from the group comprising amino, C1-C5 alkyl, phenyl, naphthyl, furan-2-yl, furan-3-yl, thiophen-3-yl, thiophen-2-yl, benzofuryl, C1-C5 alkylsulfanyl, C1-C5 alkylamino, di(C1-C5 alkyl)amino, C1-C5 alkoxy.
• R is selected from the group comprising amino, thiophen-3-yl, furan-2-yl, furan-3-yl, benzofuran-2-yl, methylsulfanyl, methoxy, dimethylamino or methyl.
• the term "pharmaceutically acceptable salts” refers to salts that retain the biological effectiveness and properties of the compounds of this invention and which are not biologically or otherwise undesirable.
• the compounds of the present invention are capable of forming acid and/or base salts by virtue of the presence of amino group or groups similar thereto.
• Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids.
• Inorganic acids from which salts can be derived include, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like.
• Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p -toluenesulfonic acid, salicylic acid, and the like.
• Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases.
• Inorganic bases from which salts can be derived include, for example, sodium, potassium, lithium, ammonium, calcium, magnesium, iron, zinc, copper, manganese, aluminum, and the like; particularly preferred are the ammonium, potassium, sodium, calcium and magnesium salts.
• Organic bases from which salts can be derived include, for example, primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines, basic ion exchange resins, and the like, specifically such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, and ethanolamine.
• the pharmaceutically acceptable salts of the present invention can be synthesized from a parent compound, a basic or acidic moiety, by conventional chemical methods.
• such salts can be prepared by reacting free acid forms of these compounds with a stoichiometric amount of the appropriate base (such as Na, Ca, Mg, or K hydroxide, carbonate, bicarbonate, or the like), or by reacting free base forms of these compounds with a stoichiometric amount of the appropriate acid.
• Such reactions are typically carried out in water or in an organic solvent, or in a mixture of the two.
• non-aqueous media like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile are preferred, where practicable.
• Lists of additional suitable salts can be found, e.g., in Remington's Pharmaceutical Sciences, 20th ed., Mack Publishing Company, Easton, Pa., (1985 ), which is herein incorporated by reference.
• the present invention provides the following pyridopyrrolopyrimidine ribonucleosides of formula I :
• the present invention provides compounds of formula I for use as a medicament.
• the present invention provides substituted pyridopyrrolopyrimidine ribonucleosides of formula I for inhibition of pathological cell proliferation of tumor or non-tumor or cancer disease associated with cell hyperproliferation.
• the present invention provides substituted pyridopyrrolopyrimidine ribonucleosides of formula I for use in a method of treatment of tumor or cancer diseases, covering e.g. epithelial, mesenchymal and neuroectoderm origin tumors.
• the present invention provides substituted pyridopyrrolopyrimidine ribonucleosides of formula I for use in a method of treatment of non-tumor disease associated with cell hyperproliferation.
• the present invention provides substituted pyridopyrrolopyrimidine ribonucleosides of formula I for the preparation of a medicament for treatment of tumor or cancer diseases, covering e.g. epithelial, mesenchymal and neuroectoderm origin tumors.
• the tumors and cancers are selected from hematopoietic cancers such as leukemias; lung cancers such as lung adenocarcinoma, colorectal cancer, osteosarcoma, cancers of breast, prostate, pancreas, gastrointestinal tract, kidney, liver, head and neck, brain.
• hematopoietic cancers such as leukemias
• lung cancers such as lung adenocarcinoma, colorectal cancer, osteosarcoma, cancers of breast, prostate, pancreas, gastrointestinal tract, kidney, liver, head and neck, brain.
• the present invention provides a pharmaceutical composition
• a pharmaceutical composition comprising a therapeutically effective amount of a compound of formula I and one or more pharmaceutically acceptable excipients.
• the invention also provides a method of treating a neoplastic disease or cellular proliferation disease in a subject comprising administering to the subject a therapeutically effective amount of a compound of formula I .
• terapéuticaally effective amount of a compound of the present invention refers to an amount of the compound of the present invention that will elicit the biological or medical response of a subject, or ameliorate symptoms, slow or delay disease progression, or prevent a disease, etc.
• the "effective amount” refers to the amount that inhibits or reduces proliferation of cancer cells, or inhibiting or reducing tumor/cancer growth in vitro or in vivo, or inhibiting or reducing a neoplastic disease in a subject such as a mammal.
• it also refers to the amount that reduces the primary tumor/cancer size, inhibits cancer cell infiltration into peripheral organs, slows or stops tumor metastasis, or relieves at least to some extent one or more symptoms associated with tumor or cancer, etc..
• the term “subject” refers to an animal. Preferably, the animal is a mammal.
• the term “subject” also refers to for example, primates (e.g., humans), cows, sheep, goats, horses, dogs, cats, rabbits, rats, mice, fish, birds and the like. In a preferred embodiment, the subject is a human.
• the term "pharmaceutically acceptable excipient” includes any and all solvents, dispersion media, coatings, surfactants, antioxidants, preservatives (e.g., antibacterial agents, antifungal agents), isotonic agents, absorption delaying agents, salts, drugs, drug stabilizers, binders, excipients, disintegration agents, lubricants, sweetening agents, flavoring agents, dyes, such like materials and combinations thereof, as would be known to one of ordinary skill in the art (see, for example, Remington's Pharmaceutical Sciences, 18th Ed. Mack Printing Company, 1990, pp. 1289-1329 , incorporated herein by reference). Except in so far as any conventional excipient is incompatible with the active ingredient, its use in the therapeutic or pharmaceutical compositions is contemplated.
• the invention provides compounds of formula I for use in the form of active substance of a pharmacologically acceptable medium, which can be made by common procedures known in the field, e.g. active substance can be bound to or mixed with pharmaceutically acceptable inert (in)organic excipients.
• the invention also provides compounds of formula I for use as a second active substance, which has synergistic effect with other active substances in known medicaments, or administration of compounds of formula I together with such medicaments.
• the present invention provides a compound of formula I as a prodrug or in other suitable form, which releases active compound in vivo.
• Desired 4-substituted pyridopyrrolopyrimidine ribonucleosides were prepared using Pd-catalyzed cross-coupling reactions or nucleophilic substitutions.
• Methyl derivatives were synthesized by palladium-catalyzed alkylation of 4-halogenated nucleosides with trimethylaluminium and dimethylaminoderivative by nucleophilic substitution with dimethylamine.
• 2-Furyl group was introduced into position 4 by Stille coupling with 2-furyltributylstannane, 3-furyl, 3-thiophenyl and 2-benzofuryl groups by Suzuki reaction with corresponding boronic acids.
• Table 1 Synthesis of 4-substituted pyridopyrrolopyrimidine nucleosides 15, 1 Entry Conditions R Protected nucleoside Yield [%] Deprotected nucleoside Yield [%] 1 a OMe - - 1a 62 2 b SMe 15b 52 1b 50 3 c NH 2 - - 1c 52 4 e Me 15d 69 1d 87 5 d NMe 2 15e 82 1e 81 6 f furan-2-yl 15f 90 1f 75 7 g furan-3-yl 15g 73 1g 78 8 g thiophen-3-yl 15h 70 1h 70 9 h benzofuran-2-yl 15i 56 1i 69
• Table 2 Synthesis of 4-substituted pyridopyrrolopyrimidine nucleosides 16, 2 Entry Conditions R Protected nucleoside Yield [%] Deprotected nucleoside Yield [%] 1 a
• test compounds showed activity in in vitro cytotoxic test, it was selective against broad spectrum of cancer cell lines of various histogenetic origin (mesenchymal or epitelial tumors) with significantly lower activity against normal human fibroblasts (BJ and MRC-5 cell lines).
• Active compounds showed significant submicromolar in vitro cytotoxic activities.
• NMR spectra were recorded on a 400 MHz ( 1 H at 400 MHz, 13 C at 100.6 MHz), a 500 MHz ( 1 H at 500 MHz, 13 C at 125.7 MHz), or a 600 MHz ( 1 H at 600 MHz, 13 C at 150.9 MHz) spectrometer. Melting points were determined on a Stuart SMP40 and are uncorrected. Optical rotations were measured at 25 °C, and [ ⁇ ] D 20 values are given in 10 -1 deg cm 2 g -1 . High resolution mass spectra were measured using ESI, EI or APCI techniques.
• Reverse-phase high performance flash chromatography was performed on Reverse Phase (C18) RediSep Rf columns on ISCO CombiFlash Rf.
• FT IR spectra were measured on Bruker Alpha spectrometer using ATR technique. The purity of all tested compounds was confirmed by HPLC analysis and was > 95%.
• Table 3 List of Compounds in Examples Example Compound Structure Systematic name 1 1a 4-methoxy-9-( ⁇ -D-ribofuranosyl)-9 H- pyrido[2',3':4,5]pyrrolo[2,3- d ]pyrimidine 2 1b 4-(methylsulfanyl)-9-( ⁇ -D-ribofuranosyl)-9 H- pyrido[2',3':4,5]pyrrolo[2,3- d ]pyrimidine 3 1c 4-amino-9-( ⁇ -D-ribofuranosyl)-9 H- pyrido[2',3':4,5]pyrrolo[2,3- d ]pyrimidine 4 1d 4-methyl-9-( ⁇ -D-ribofuranosyl)-9 H- pyrido[2',3':4,5]pyrrolo[2,3- d ]pyrimidine 5 1e 4-(dimethylamino)-9-( ⁇ -
• the compound 6 was prepared as described above for derivative 5A and 5B in example 1. Crude material was purified by column chromatography on silica (petroleum ether/EtOAc 0 ⁇ 90%) to obtain product 6 (705 mg, 95%) as an orange foam.
• the compound 7 was prepared according to modified literature procedure ( Reader, J. C.; Matthews, T. P.; Klair, S.; Cheung, K. M.; Scanlon, J.; Proisy, N.; Addison, G.; Ellard, J.; Piton, N.; Taylor, S.; Cherry, M.; Fisher, M.; Boxall, K.; Burns, S.; Walton, M. I.; Westwood, I. M.; Hayes, A.; Eve, P.; Valenti, M.; de Haven Brandon, A.; Box, G.; van Montfort, R. L.; Williams, D. H.; Aherne, G. W.; Raynaud, F. I.; Eccles, S.
• the compound 8 was prepared as described above for derivative 7 in example 3, from compound 6 (2.9 g, 12.3 mmol). After filtration, compound 8 (1.8 g, 73%) was obtained as a brown solid.
• the compound 10 was prepared as described above for derivative 9 in example 5, from compound 8 (2.1 g, 10.2 mmol). After filtration, compound 10 was obtained as a brown solid (1.5 g, 79%).
• Tricyclic modified nucleobase 11 was prepared according to modified literature procedure ( Liu, J.; Janeba, Z.; Robins, M. J. SNAr Iodination of 6-Chloropurine Nucleosides: Aromatic Finkelstein Reactions at Temperatures Below -40 °C Org. Lett.
• the compound 12 was prepared as described above for derivative 11 in example 7, from compound 10 (572 mg, 3.1 mmol). After adjusting pH to 4-5 by NH 3 (35%), solvent was evaporated and the crude material was purified by column chromatography on silica (CHCl 3 /MeOH 0 ⁇ 10%) to obtain product 12 (330 mg, 52%) as a yellow solid.
• the protected nucleoside 14 was prepared as described above for derivative 13 in example 9, from tricyclic base 12 (100 mg; 0.5 mmol). The crude material was purified using column chromatography (cyclohexane/EtOAc 0 ⁇ 50%). Desired protected nucleoside 14 (185 mg, 57%) was obtained as a straw foam.
• nucleoside 13 (135 mg, 0.2 mmol) in a mixture of MeOH (14 mL) and DMF (14 mL)
• sodium methoxide 190 ⁇ L, 25 wt.% in MeOH, 0.84 mmol
• the reaction mixture was stirred for 16 h at 90 °C, then MeOH was evaporated and the crude material crystallized from mixture DMF/acetone.
• Nucleoside 1a (41 mg, 62%) was obtained as a white powder.
• nucleoside 14 210 mg, 0.32 mmol
• MeOH 21 mL
• sodium methoxide 296 ⁇ L, 25 wt.% in MeOH, 1.28 mmol
• the reaction mixture was stirred for 16 h at 22 °C, then MeOH was evaporated and the crude material was purified using revers phase column chromatography (C-18, water/MeOH 0 ⁇ 100%).
• Nucleoside 2a (42 mg, 42%) was obtained as a white powder.
• nucleoside 13 350 mg, 0.54 mmol
• DMF 80 mL
• sodium thiomethoxide 113 mg, 1.62 mmol
• the reaction mixture was stirred for 16 h at 22 °C, then solvent was evaporated and the crude material was purified using column chromatography (petroleum ether/EtOAc 0 ⁇ 80%).
• Protected nucleoside 15b (186 mg, 52%) was obtained as a white powder.
• nucleoside 15b 180 mg, 0.3 mmol was dissolved in a mixture of MeOH (6 mL) and DMF (10 mL), and sodium methoxide (14 ⁇ L, 25 wt.% in MeOH, 0.06 mmol) was added. The reaction mixture was stirred at 90 °C for 16 h. Solvent was evaporated under reduced pressure and product was crystallized from MeOH. Nucleoside 1b (79 mg, 76%) was obtained as a white powder.
• nucleoside 14 (221 mg, 0.34 mmol) in MeOH (55 mL) was stirred. The reaction mixture was stirred at 22 °C for 16 h, then the solvent was evaporated and the crude material was purified by a reverse phase column chromatography (C-18, H 2 O/MeOH 0 ⁇ 100%). Nucleoside 2b (56 mg, 47%) was obtained as a white powder.
• nucleoside 13 300 mg, 0.46 mmol
• aque. ammonia 6.5 mL
• the reaction mixture was heated in a pressure tube at 120 °C for 24 h. After that, solvents were evaporated and the crude material was purified by reverse phase column chromatography (C-18, H 2 O/MeOH 0 ⁇ 100%). Nucleoside 1c (77 mg, 53%) was obtained as a white powder.
• Nucleoside 16 was prepared as described above for derivative 15d in example 18, from chlorinated intermediate 14 (400 mg, 0.62 mmol). The reaction mixture was stirred at 70 °C for 16 h. The solvent was evaporated and the crude reaction mixture was purified by column chromatography (SiO 2 , cyclohexane/EtOAc 0 ⁇ 100%). Protected nucleoside 16d (215 mg, 55%) was obtained as a yellow powder.
• nucleoside 15d (340 mg, 0.54 mmol) in MeOH (12 mL) and DMF (10 mL) mixture, sodium methoxide (37 ⁇ L, 25 wt.% in methanol, 0.16 mmol) was added. The reaction mixture was stirred for 16 h at 90 °C, then the solvent was evaporated and the product was crystallized from MeOH:CHCl 3 mixture. Nucleoside 1d (149 mg, 87%) was obtained as a white powder.
• nucleoside 16d (218 mg, 0.35 mmol) in MeOH (7.7 mL) was added sodium methoxide (24 ⁇ L, 25 wt.% in methanol, 0.11 mmol). The reaction mixture was stirred for 16 h at 22 °C, then the solvent was evaporated and the crude material was purified using reverse phase column chromatography (C-18, water/MeOH 0 ⁇ 100%). Nucleoside 2d (69 mg, 63%) was obtained as a white powder.
• nucleoside 13 (593 mg, 0.91 mmol) in the mixture of isopropanol (20 mL) and dichloromethane (7 mL), dimethylamine (1.36 mL, 2M in THF, 2.73 mmol) was added in one portion. The reaction mixture was stirred at 22 °C for 16 h. Solvent was evaporated and the crude material was purified by column chromatography (SiO 2 , petroleum ether/EtOAc 0 ⁇ 50%). Protected nucleoside 15e (495 mg, 82%) was obtained as a white powder.
• Protected nucleoside 16e was prepared as described above for derivative 15e in example 22, from chlorinated intermediate 14 (500 mg, 0.77 mmol). After solvent was evaporated, the crude mixture was purified by column chromatography (SiO 2 , cyclohexane/EtOAc 0 ⁇ 80%). Protected nucleoside 16e (339 mg, 67%) was obtained as a white powder.
• nucleoside 15e 320 mg, 0.49 mmol
• MeOH MeOH
• sodium methoxide 34 ⁇ L, 25 wt.% in methanol, 0.15 mmol
• the reaction mixture was stirred for 16 h at 22 °C, then the solvent was evaporated and the crude material was purified using reverse phase column chromatography (C-18, water/MeOH 0 ⁇ - 100%).
• Nucleoside 1e 136 mg, 81%) was obtained as a white powder.
• Nucleoside 2e was prepared as described above for derivative 1e in example 24, from protectednucleoside 16e (292 mg, 0.44 mmol). The crude material was purified using reverse phase column chromatography (C-18, water/MeOH 0 ⁇ 100%). Nucleoside 2e (140 mg, 91%) was obtained as a white powder.
• Protected nucleoside 15f was prepared according to the general procedure A. Chlorinated intermediate 13 (400 mg, 0.62 mmol), 2-(tributylstannyl)furan (292 ⁇ l, 0.93 mmol) and PdCl 2 (PPh 3 ) 2 (44 mg, 0.06 mmol) were used. Desired nucleoside 15f (378 mg, 90%) was obtained as a pinkish solid.
• Protected nucleoside 15f was prepared according to the general procedure A. Protected nucleoside 14 (400 mg, 0.62 mmol), 2-(tributylstannyl)furan (292 ⁇ l, 0.93 mmol) and PdCl 2 (PPh 3 ) 2 (44 mg, 0.06 mmol) were used. Desired nucleoside 16f (274 mg, 66%) was obtained as a pinkish solid.
• nucleoside 15f 300 mg, 0.44 mmol
• MeOH 14 mL
• sodium methoxide 30 ⁇ L, 25 wt.% in methanol, 0.13 mmol
• the reaction mixture was stirred for 16 h at 70 °C, then solvent was evaporated and the crude material was purified using reverse phase column chromatography (C-18, water/MeOH 0 ⁇ - 100%).
• Nucleoside 1f 122 mg, 75%) was obtained as a white solid.
• nucleoside 16f 230 mg, 0.34 mmol
• MeOH MeOH
• DMF 4.5 mL
• sodium methoxide 22 ⁇ L, 25 wt.% in methanol, 0.10 mmol
• the reaction mixture was stirred for 16 h at 60 °C, then solvent was evaporated and the crude material was purified using column chromatography (CHCl 3 /MeOH 0 ⁇ 10%).
• Nucleoside 2f (88 mg, 71%) was obtained as a pinkish solid.
• nucleoside 15g (283 mg, 0.42 mmol) in MeOH (13 mL) was added sodium methoxide (30 ⁇ L, 25 wt.% in methanol, 0.13 mmol). The reaction mixture was stirred for 16 h at 70 °C.
• nucleoside 15h 160 mg, 0.23 mmol
• MeOH MeOH
• sodium methoxide 16 ⁇ L, 25 wt.% in MeOH, 0.07 mmol
• the reaction mixture was stirred for 16 h at 50 °C, and then the solvent was evaporated and the crude material was purified using column chromatography (SiO 2 , CHCl 3 /MeOH 0 ⁇ 10%).
• Nucleoside 1h (62 mg, 70%) was obtained as a white solid.
• Nucleoside 2h was prepared as desribed for compound 1h, from protected nucleoside 16h (268 mg, 0.39 mmol). The reaction mixture was stirred for 16 h at 60 °C, and then solvent was evaporated and crude material was purified using column chromatography (SiO 2 , CHCl 3 /MeOH 0 ⁇ 10%). Nucleoside 2h (106 mg, 72%) was obtained as a white solid.
• nucleoside 15i 180 mg, 0.25 mmol
• MeOH 8 mL
• sodium methoxide 17 ⁇ L, 25 wt.% in MeOH, 0.08 mmol
• the reaction mixture was stirred 16 h at 70 °C.
• the solvent was evaporated and the product was crystallized from MeOH.
• Nucleoside 1i 71 mg, 69%) was obtained as a yellowish solid.
• nucleoside 16i (249 mg, 0.25 mmol) in MeOH (10 mL) was added sodium methoxide (23 ⁇ L, 25 wt.% in MeOH, 0.10 mmol). The reaction mixture was stirred for 16 h at 60 °C. Then the solvent was evaporated and the crude material was purified using column chromatography (SiO 2 , CHCl 3 /MeOH 0 ⁇ - 10%). Nucleoside 2i (112 mg, 79%) was obtained as a yellowish solid.
• cytotoxic MTS test Nosková V. et al., Neoplasma 2002, 49, 418-425 .
• cell lines K562 human acute myeloid leukemia
• K562-Tax human acute myeloid leukemia, paclitaxel resistant subline, overexpress multiple drug resistant protein PgP
• CEM T-lymfoblastic leukemia
• CEM-DNR-bulk T-lymfoblastic leukemia, doxorubicin resistant
• A549 human lung adenocarcinoma
• HCT116p53 wt human colorectal cancer, wild-type
• HCT116p53-/-(human colorectal cancer, mutant p53) a U2OS human bone osteosarcoma
• the compounds in this patent are useful as pharmaceuticals or components of drugs effective against cancer and leukemia.

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